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Bi Fold Door Repairs If the hardware is damaged, it could make it difficult to operate bi-fold doors. The top hinges, and bottom rollers, are the most frequently damaged parts that need to be serviced or replaced. Dirt and dust can also block the door track which can cause it to stick. This is a simple fix by getting rid of the dirt and then cleaning. Fixing the hinges Bi-fold doors are able to open up a room in